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No. 607,802. Patented .Iuly l9, I898. W. KORTUM.

DEVICE FOR STERILIZING MILK, &c.

(Application filed Nov. 30, 1896.)

3 Sheets-Sheet I.

(No Model.)

Vdnesses:

THE NORRIS wnzns no" PHOTO-LITHO., WASHINGYON, n4 (7,.

No. 607,802. Patented July 19, I898. W. KORTUM.

DEVICE FOR STEBILIZING MJLK, 81.0. (Application filed Nov. 30, 1896.) (No Model.) v 3 $heets-Sheet 2.

"ms Ncmms PETERS co, mom-urns" wasumm'c, b. c.

No. 607,802. Patented July l9, I898.

W. KORTUM.

DEVICE FOR STERILIZING MILK; 8w.

(Application filed Nov. 30, 1896.)

(No Model.) 3 Sheets-Sheet 3.

Fig.8.

Witnesses 1n: uonms vrrzns (70.. FHDTO-LITNQ, WASHWGTON, n. c

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WILIIELM KORTIIM, OF BERLIN, GERMANY..

DEVICE FOR STERILIZING MILK, 800.

SPECIFICATION forming part of Letters Patent No. 607,802, dated July 19, 1898. Application filed November 30, 1896. Serial N0 613,965. (No model.)

To all whom, it may concern.-

Be it known that I, W'ILHELM KoR'riiM, a subject of the German Emperor, residing at Berlin, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Devices for Sterilizing Milk and other Liquids, of which the following is a specification.

Myinvention relates to devices for sterilizing milk and other liquids; and the objects of my invention are, first, to provide an apparatus through which the milk flows continuously in thin layers and in close contact with heating-surfaces; second, to impart to the liquid passing through the apparatus a rotary movement to prevent any depositions and burning of the same, and, third, to provide within the apparatus a chamber through which the liquid flows slowly toward the outlet and is kept for some while at its raised temperature for the purpose of attaining a homogeneous boiled product. I attain these objects by the apparatus represented in the accompanying d rawings, in which Figure 1 is a vertical section on the line A B, Fig. 2; Fig. 2, a horizontal section on the line C D, Fig. 1; Figs. 3 and 4, similar sections of a modification of my invention, corresponding to Figs. 1 and 2, respectively; Figs. 5 and 6, similar sections of another modification of my invention; Figs. 7, 8 and 9, vertical sections of further modifications of my invention.

In the apparatus represented in Figs. 1 and 2, a. is a cylindrical casing of suitable ma terial, provided with a bottom plate b and a detachable cover-plate o. The casing'a con: tains a system of cylindrical partitions d e f, concentrically connected together, the outer partition cl being steam-tightly secured at its upper end to the casing a and the inner partition f connected at its lower end to the bottom plate I) and forming a middle chamber III. A similar system of partitions g h, connected together at their lower ends, is secured to the cover-plate c and projects into the annular space between the partitions d e, leaving clear spaces I II for the passage of the liquid to beheated. The same enters through '2; the middle space III. It then passes in a zigzag way through spaces II and I, forming a thin layer corresponding to the small space between the partitions c 72 g d. The heating mediumas steam, hot water, &c.-is admitted through the pipe Z into the hollow space IV V between the casing a and the partitions cl 6 f and is discharged by the pipe m. The chamber VI, formed by the partitions g h, is supplied with steam or another heating medium through a pipe at, 0 being the discharging-pipe. By these means the liquid passes between heated surfaces and is discharged by a pipe after having been raised to the required degree of heat. A stirring device consisting of bent arms 1), nearly filling the spaces III II I and projecting from a shaft q, is provided in the middle of the apparatus and kept in rotary movement by any suitable means, so as to impart a similar movement to the liquid passing through the same spaces. In the modification represented in Figs. 3 and 4 the outmost partition d projects freely and extends downward to the bottom plate Z). By these means space IV between the partitions at and d communicates with the annular space I, passed through bythe hot milk, space IV thus forming the above-mentioned chamber for the liquid, in which the same descends to the discharging-pipe it without being agitated by the arms 19 of the stirring device, not reaching the chamber IV, and without being further heated, so as to be kept for some while at its raised temperature. Z and n are supply-pipes, and 'm and 0 are discharging-pipes for the heating medium, as before described. In the modification of myinvention represented in Figs. 5 and 6 another partition t is provided, projecting downward from the cover-plate 0, so as to form two annular spaces VII VIII, and the stirring-arms are prolon gated to fill the space VII. Space IV is used again for heating purposes, as before described with reference to Fig. 1, and space VIII forms the above-mentioned chamber for keeping the milk for some While at its raised temperature and in a quiet condition before it leaves the apparatus by the dischargingpipe is at the top of the casing a. The modification of Fig. 7 does not differ from that represented in Fig. 1 as concerning the construction, but is intended to be used in an inverted order. The liquid to be heated enters at i in the upper part of the apparatus and at its outer periphery and leaves the same by ICO pipe 70 at the middle of its bottom. The heat ing medium flows likewise invertedly through the heating-chambers, entering through pipe I and being discharged by pipe m.

In the modification represented in Fig. 8 the flow of the liquid to be heated and of the heating medium is the same as in the modification of Fig. 7, the only difference from that figure consisting in that the innermost partition f and the corresponding part of the stirringarms are omitted and partition e extends downward to the bottom 1), closing the inside of the heating-chamber formed by the partition (1 and the casing a. Supplypipe Z discharges accordingly into the latter chamber.

Fig. 9 represents a modification of Fig. 8, in which the partition e extends through the bottom plate Z) and is closed by a bottom plate 10, provided wit-h the discharging-pipe 7c. The projecting part of partition 6 is inclosed by a jacket '0 for preventing loss of heat.

Having now described the nature of my invention, I now proceed to explain the method of operating the same.

The milk or other liquid to be sterilized enters through 1 into the apparatus, flows through the continuous spaces formed by the partitions (1 cf g hs within the vessel a b c, and is discharged through 76, while at the same time the heating medium enters inopposite direction by Z and n and leaves the apparatus by m and a, heating the same and transmitting the heat to the liquid to be heated. The milk flowing up and down through the apparatus is contained in the spaces formed by two heat-- ing-partitions or by a heating-partition and a separating-partition and agitated by the stirring-arms p, striking the spaces, whereby burning from the heated partitions is preven ted. In the spaces formed bya mere separating-partition or by such a partition and the It will be obvious that my invention may also be used for cooling liquids by passing a cooling medium through the apparatus instead of a heating medium, the construction of the apparatus not being subjected to any alteration, and the apparatus used for cooling purposes forming likewise a part of my invention.

What I claim, and desire to secure by Letters Patent, is-

In anapparatus for heating milk and other liquids under pressure, the combination of an" outer cylindrical vessel, partitions co11- centrically arranged in said vessel and alternately connected at their top and bottom, of a detachable cover provided with depending hollow concentricallyarranged partitions, said partitions adapted to fit within the spaces between the partitions of the cylindrical vessel, thereby forming a series of communicating annular chambers adapted to receive the material to be treated, and a stirring device located in said annular chambers, substantially as described.

In witness whereof I have hereunto signed my "name in the presence of two subscribing witnesses.

WILHELM KORTUM.

Witnesses:

W. HAUPT, IIENRY I-IAsPER. 

